IMMACULATE CONCEPTION [...] In Luke 1:46-47, Mary said: “My soul doth magnify the Lord, And my spirit hath rejoiced in God my Saviour”. Mary knew that she needed a savior
Indeed she needed a savior, and she has One. Who do you think made her immaculate from conception? The redemption of the Cross works both forward and backward in time.
ALL-HOLY [...] Romans 3:23 says “For all have sinned, and come short of the glory of God”. Revelation 15:4 says, “Who shall not fear thee, O Lord, and glorify thy name? For thou only art holy”. Romans 3:10 says, “There is none righteous, no, not one”. [...] Jesus is the only person who is referred to in Scripture as sinless
So, Romans 3, if taken literally, contradicts holiness of Jesus also. It is also not true that Jesus alone is described as sinless, so is Noah (Gen 6:9), for example. Romans 3 (and Romans 5, where it is clear from context which mixes "all" and "many") speaks in broad terms of generations of fallen man. There is no reason not to contemplate an exception here for Mary, John the Baptist, and possibly other exceptional people, just like an implicit exception is made for Jesus Himself.
PERPETUAL VIRGINITY
knew her not till
"Till" MAY mean that the situation changed after the event controlled by "till", but it does not necessarily mean so. There are several usages in the Gospel including in the book of Matthew of the latter kind. This verse does not say anything of Mary and Joseph's marital relations after the birth of Jesus.
Jesus had brothers and sisters
As you yourself note, the word could be used generically. It is not true that it cannot be used generically in Greek, especially in reference to a collection of half brothers, cousins, second cousins, step brothers, etc. which most likely was the case. It would be simply tedious to enumerate all these precise terms of relation when not even giving the names, and when it is not called for by context. In two instances where names are given, from another gospel we learn that the same Joseph and James are children of Mary Cleopas. The scripture certainly allows for the interpretation that Jesus had uterine siblings, but it also allows for the historically accepted interpretation that they were relatives of some other kinds.
MOTHER OF GOD [...] He existed before Mary was born
No one disputes that Jesus pre-existed Mary. However, Jesus is one person and Mary gave birth to Him. To say that Mary gave birth to His human nature but not to His divine nature tears in two Jesus as single person. It is an old heresy, that denies the essence of the Trinity.
MOTHER OF THE CHURCH
No contradiction is even alleged here.
ASSUMPTION
No contradiction is even alleged here. In addition, "There is no biblical reference to the assumption of Mary" is plain wrong, Mary is shown as Queen of Heaven fighting Satan on behalf of her Church in Apocalypse 12.
CO-MEDIATOR [...] There is only one mediator and that is Jesus
No one disputes that. If Mary co-mediated, say, Mohammed, the critic would have a point, but she leads to Jesus, Who alone mediates before God. A scriptural case for such mediation is the miracle at Cana, as well as the simple fact that Jesus came to us through Mary.
QUEEN OF HEAVEN
It is not clear where the alleged contradiction is. In the instance where Mary is venerated by a woman in the crowd, Jesus did not tell her to stop venerating Mary, but rather urged to venerate all saints as well. The direct prooftext for "Queen of Heaven" is Apocalypse 12.
“QUEEN OF HEAVEN
It is not clear where the alleged contradiction is. In the instance where Mary is venerated by a woman in the crowd, Jesus did not tell her to stop venerating Mary, but rather urged to venerate all saints as well. The direct prooftext for “Queen of Heaven” is Apocalypse... “
No contradiction, Anna. The title Queen of Heaven is foreshadowed in Psalm 45
6 - 11 Thy throne, O God, is for ever and ever; the sceptre of they kingdom is a right sceptre.
Thou lovest righteousness, and hatest wickedness; therefore God, they God hath annointed thee with the oil of Gladness above they fellows.
All thy garments smell of myrrh, and aloes, and cassia, out of the Ivory palaces, whereby they have made thee glad
Kings’ daughters were among they honourable women; upon thy right hand did STAND THE QUEEN IN GOLD OF OPHIR.
Hearken, O daughter and consider and incline thine ear, forget also thine own people, and thy father’s house
So shall the king greatly desire thy beauty; for he thy Lord; and worship thou Him.”
The Kingdom ruled by God is the same Kingdom ruled eternally by the Son of David. The Queen of that Kingdom is the Blessed Virgin Mary, The Mother of the Lord, God, Jesus.
No contradiction.